From Klober
The Under Batten GRP Dry Valley provides a robust, durable and lightweight alternative to lead and zinc valleys. Area of application Suitable for: 20° maximum pitch variance 17.5° minimum rafter pitch 60° maximum rafter pitch Key Features Lightweight and flexible to handle for a safe and easy installation. A cost effective alternative to lead. Fire tested to comply with BS476: Part 3 SAB and Part 7 Class 3. 80mm Batten suitable for Slate, Flat & Plain Tiles 105mm Batten suitable for Profile Tiles